
Call it off Sony, no need to throw any precious man hours into making your perennially #2 handheld into some sort of amazing featurephone hybrid, some hacker has already done it for you. Through the amazing wonders of modern thinphone technology, soldering irons and probably a bit of glue, some hacker has managed the slap a Haier touchscreen phone onto the back of his PSP -- killing the UMD drive in the process, but we'd say it was well worth it.
http://www.engadget.com/2008/08/08/psp-phone-mod-is-really-exactly-what-we-were-waiting-for/